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USN-8987-1: libuser vulnerabilities

USN-8987-1: libuser vulnerabilities

Ubuntu • November 3, 2026

It was discovered that libuser did not properly validate the GECOS field when changing user information. A local attacker could possibly use this issue to corrupt the passwd file, resulting in a denial of service. ( CVE-2015-3245 ) It was discovered that libuser modified the passwd file in place when updating user information. A local attacker could possibly use this issue to cause an inconsistent file state, resulting in a denial of service, or possibly escalate privileges. ( CVE-2015-3246 )

It was discovered that libuser did not properly validate the GECOS field when changing user information. A local attacker could possibly use this issue to corrupt the passwd file, resulting in a denial of service. ( CVE-2015-3245 )

It was discovered that libuser modified the passwd file in place when updating user information. A local attacker could possibly use this issue to cause an inconsistent file state, resulting in a denial of service, or possibly escalate privileges. ( CVE-2015-3246 )

It was discovered that libuser did not properly validate the GECOS field when changing user information. A local attacker could possibly use this issue to corrupt the passwd file, resulting in a denial of service. ( CVE-2015-3245 ) It was discovered that libuser modified the passwd file in place when updating user information. A local attacker could possibly use this issue to cause an inconsistent file state, resulting in a denial of service, or possibly escalate privileges. ( CVE-2015-3246 )

It was discovered that libuser did not properly validate the GECOS field when changing user information. A local attacker could possibly use this issue to corrupt the passwd file, resulting in a denial of service. ( CVE-2015-3245 )

It was discovered that libuser modified the passwd file in place when updating user information. A local attacker could possibly use this issue to cause an inconsistent file state, resulting in a denial of service, or possibly escalate privileges. ( CVE-2015-3246 )

In general, a standard system update will make all the necessary changes.

The problem can be corrected by updating your system to the following package versions:

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